* 1.3:
  updated changelog
  allowed Twig 2.0
  allowed Symfony 3.0
  simplifed composer.json
  fixed some Form deprecations
  removed deprecated method call in the exception handler
  fixed test that did not restore the error handler properly
  added symfony/phpunit to catch deprecation notices
  Verify that the spool is enabled and an actual spool before flushing it
  [Docs] Add some links in the services chapter